full code with placeholder 에서&nbsp;
<div style="background-color: #fffffe; font-family: monospace, Consolas, 'Courier New', monospace; font-size: 14px; line-height: 19px; white-space: pre;">cost_val,&nbsp;W_val,&nbsp;b_val,&nbsp;train&nbsp;=&nbsp;sess.run([cost,&nbsp;W,&nbsp;b,&nbsp;_],&nbsp;feed_dict={x:[1,2,3,4,5],&nbsp;y:&nbsp;[2.1,&nbsp;3.1,&nbsp;4.1,&nbsp;5.1,&nbsp;6.1]})</div>
<div style="background-color: #fffffe; font-family: monospace, Consolas, 'Courier New', monospace; font-size: 14px; line-height: 19px; white-space: pre;">여기서 train이 의미하는게 무엇인지 모르겠습니다. train이 꼭 있어야 하는 이유가 무엇인가요</div>

인프런 커뮤니티 질문&답변

train 의미